Quote:
Originally Posted by Daox
Any updates on the floor insulation work?
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Yes, updates for sure...
Phase 1 is complete, which is installing the 2" EPS layers under the floor, as per this diagram:
Overall, this involved:
- Installing vapor barrier on ground and part way up the foundation stem walls.
- Installing 1/2" spacer strips next to floor joists.
- Fitting 2" EPS rigid insulation board.
- Sealing all cracks between EPS & wood and EPS & EPS with 1-part foam sealer.
- Sealing all potential air leak areas above the sill plate and below the floor structure with EPS & 1-part foam.
Before, I had only sub-floor & floor which gave me an abysmal
- Floor & subfloor = R-1.5
- Inside air film = R-0.68
- outside air film = R-0.17
TOTAL = R-2.35
Now, I calculate:
- Inside air film above floor = R-0.68
- Floor & subfloor = R-1.5
- Inside air film below flooring = R-0.68
- R value of 1/2" air space = R-1
- Inside air film above EPS (one surface reflective) = R-2.23
- Two inches EPS = R-4/in or R-8 total
- Outside air film below EPS = R-0.17
TOTAL = 14.26 - 18% = R-12
[NOTE: the final value has been reduced by 18% due to thermal bridging.]
At this point I should be OK for the winter... at least it's way better than it was for the past 122 years.
I gotta say, it doesn't feel like a dank nasty crawl space any more, more like a room... not that I am tempted to spend any leisure time in there!
Best,
-AC